"The question arises: By what means may the spiritual man be freed from these psychical meshes and disguises, so that he may stand forth above death, in his radiant eternalness and divine power? And the second book sets itself to answer this very question, and to detail the means in a way entirely practical and very lucid, so that he who runs may read, and he who reads may understand and practise. The second part of the second book is concerned with practical spiritual training, that is, with the earlier practical training of the spiritual man."
January 1, 1970
https://en.wikiquote.org/wiki/Yoga_Sutras_of_Patanjali